Directional correlations in quantum walks with two particles

Quantum walks on a line with a single particle possess a classical analogue. Involving more walkers opens up the possibility of studying collective quantum effects, such as many-particle correlations. In this context, entangled initial states and the indistinguishability of the particles play a role. We consider the directional correlations between two particles performing a quantum walk on a line. For non-interacting particles, we find analytic asymptotic expressions and give the limits of directional correlations. We show that by introducing delta-interaction between the particles, one can exceed the limits for non-interacting particles

Continuous deformations of the Grover walk preserving localization

The three-state Grover walk on a line exhibits the localization effect characterized by a non-vanishing probability of the particle to stay at the origin. We present two continuous deformations of the Grover walk which preserve its localization nature. The resulting quantum walks differ in the rate at which they spread through the lattice. The velocities of the left and right-traveling probability peaks are given by the maximum of the group velocity. We find the explicit form of peak velocities in dependence on the coin parameter. Our results show that localization of the quantum walk is not a singular property of an isolated coin operator but can be found for entire families of coins

Methods of risk analysis of telematic objels

The paper focuses on basic description of the tunnel as a telematic object and its architecture. Conventional methods of risk analysis of telematic objects are introduced in relation to their safety. New approaches of risk quantification are shown in connection to existing legislation and directives of European Commission

REMEDIATION OF A RAILWAY EMBANKMENT USING GEOCELLS AND DEEP SOIL MIXING - A NUMERICAL ANALYSIS

Progressive settlement of the embankment under the railway track near Žďár nad Sázavou, the Czech Republic, has been observed for many years. Immediate improvement was needed to secure the safety of the traffic and to increase the travel speed of the track. The reconstruction work consisted of deep soil mixing. Also, a load spreading geocell reinforced mattress was designed. The evaluation of the proposed solution by means of numerical modelling and associated laboratory testing is described in the paper

Multi-Particle Universal Processes

We generalize bipartite universal processes to the subclass of multi-particle universal processes from one to N particles. We show how the general statement for a multi-particle universal process can be constructed. The one-parameter family of processes generating totally anti-symmetric states has been generalized to a multi-particle regime and its entanglement properties have been studied. A view is given on the complete positivity and the possible physical realization of universal processes.

Full-revivals in 2-D Quantum Walks

Recurrence of a random walk is described by the Polya number. For quantum walks, recurrence is understood as the return of the walker to the origin, rather than the full-revival of its quantum state. Localization for two dimensional quantum walks is known to exist in the sense of non-vanishing probability distribution in the asymptotic limit. We show on the example of the 2-D Grover walk that one can exploit the effect of localization to construct stationary solutions. Moreover, we find full-revivals of a quantum state with a period of two steps. We prove that there cannot be longer cycles for a four-state quantum walk. Stationary states and revivals result from interference which has no counterpart in classical random walks

Constructive-technological project of factory building in Rokycany

Práce řeší technologickou přípravu výrobní haly v Rokycanech. Jde o betonovou prefabrikovanou konstrukci založenou na vrtaných pilotách. Obsahem projektu je návrh zařízení staveniště, dimenzování strojů a mechanismů, harmonogram prací, technologické předpisy vybraných procesů a plán bezpečnosti a ochrany zdraví při práci.Master´s Thesis describes the realization setup procedure of factory building in Rokycany. Building has precast concrete skeleton based on in-situ concrete piles. Document consists of concept of site accommodation, sizing of building machines, time schedule, technological rules and constraints for the chosen technological processes and plan of workplace safety and health.

Road tunnels safety according to European legislation

The article deals with safety of European road tunnels in accordance with actual European legislation. Standards and recommendations of European Commission, PIARC and other professional bodies of the European Union define minimal technological requirements for equipment and operation of the tunnels in scope of Trans-European Road Network